Wine and ctl3d.dll

Dear Developers,
In going over the log file from a recent attempt to install Baldur's
Gate, I ran across the following warning:
:warn:module:BUILTIN32_dlopen cannot open .so lib for builtin
ctl3d.dll: ctl3d.dll.so: cannot open shared object file: No such file
or directory
I looked in wine/dlls and sure enough, there was no entry for ctl3d.
What facilities does this library provide, and are there any plans to
implement it in wine?
Thanx,
Ian